Drawing-boll fob spinning machinery



U Ts sas NT OFFICE.

DANIEL R. PRATT, OF WORCESTER, MASSACHUSETTS.

DRAWING-ROLL FOR SPINNING MACHINERY.

To all 'whom t may concern:

Be it known that I, DANIEL PRATT, of VOrcester, in the county ofVo'rcester and State of Massachusetts, have invented a new vand usefulImprovement in the Manner of present used is very defective, inasmuch asit wants that degree of elasticity that is necessary for a perfect anduniversal draft on the cotton passing under it being a covering ofleather which becomes hard by use; and consequently requires frequentrepairsis liable tarot-to separate where joined; particularly in moistor damp weather-unequal elasticity of surface, being hard in some placesand soft in others-and when it becomes hard it requires more weight toproduce the required draft on the cotton than when first applied-affectsthe machinery throughout by the additional friction caused by theadditional weight-ini jures the quality of the thread and reduces theelasticity of the cloth coverings on the roll which are placed beneaththe external leather coverings. Besides each layer of cloth requires tobe glued and the external leather covering is glued at the ends.

YMy improvement is designed to remove these evils. I eect the object bymaking use of a hollow cylinder A of vulcanized india rubber andcombining it with an iron rod B having on its periphery shoulders Bturned, or cast, for confining said elastic cylinder and preventing itsmoving endwise. The said vulcanized india rubber' cylinder possessesthat degree of elasticity to admit or allow of its being expanded andslipped over the shoulders and then contracts to the diameter of theroll between said shoulders, to which it will adhere by reason of itscontractile force or nature without slipping. It also possesses thatelasticity requisite to a proper draft on cotton and to produce an evendraft.

The covering of the roll will be more durable. It will require norepairs, will not be affected by heat or cold and will not be liable tocut the thread and will produce a more proiitable roll to themanufacturerenabling him to make the metallic portion of the roller ofsmaller 'diameter and the elastic portion or external covering of theroll of the required diameter to produce the desired size of the roll bywhich a considerable weight of metal and consequent friction isdispensed with. The rolls thus covered are not so liable to crease bycontact with the fluted rolls as when covered with leather. In fact suchmaterial will notvcrease so as to remain in creasesfowing to theirelastic nature.

Condensing cylinders, or rolls, used in the manufacture of wool, androlls used in the machine for dressing, sizing and drying yarn, in themanufacture of wool and cotton, may be covered with the above namedmaterials. And in order to draw down the ends of the covering materialas seen at A Fig. l to prevent the corners of the rolls coming incontact with the tinted cylinders and the consequent wearing of thecorners of the elastic covering and winding up and breaking the cot-tonon the roughened ends, grooves B2 may be turned on the peripheries nextthe shoulder B and the ends of plain cylinders beveled off for the samepurpose.

The metallic cylinders to be covered may be made hollow or solid.

The thread made by these rolls will be less liable to break; andconsequently less at-` tendance will be needed, and will be of a moreeven size and otherwise of a superior quality.

What I claim as my invent-ion and desire to secure by Letters Patent is-The invention of covering all kinds of drawing rollers intended tooperate upon wool or cotton roving or yarn, with hollow cylinders ofvulcanized india rubber in the manner and for the purpose herein setforth; the ends of t-he elastic contractile covering being lessened indiameter at the ends by beveling the ends of the metallic cylinder andgrooving next the shoulders.

DANIEL R. PRATT. `Witnesses WVM. P. ELLIOT. ALBERT E. H. JOHNSON.

